Grille of a truck vehicle



FIG. 1 is a left, front perspective view of grille of a truck vehicle showing our new design shown installed on a truck, it may be understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a front view; and,

FIG. 4 is a right side view thereof and is a mirror image of a left side view. 

The ornamental design for a grille of a truck vehicle, as shown and described. 